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INT 7A - IBM 3270 Workstation Program API - PRESENTATION SPACE SERVICES
        AH = 09h
        BX = 8020h
        CX = 00FFh
        DX = ID of PCPSM
        AL = service
            01h define presentation space
            02h delete presentation space
            03h display presentation space
            04h position cursor in presentation space
            05h change default presentation space
        ES:DI -> control block
Return: ???
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